The infrastructure has a core network, radio network controllers linked to the core network and base stations provided with radio interfaces and each linked to one of the controllers. Ciphered information is transmitted over a first communication path in circuit mode between the core network and the...http://www.google.fr/patents/US6909887?utm_source=gb-gplus-shareBrevet US6909887 - Method of controlling a channel between a radio terminal and a cellular radiocommunication infrastructure, and access network implementing such a method
Method of controlling a channel between a radio terminal and a cellular ...
